atan2
From cppreference.com
| Defined in header <math.h>
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| float atan2f( float y, float x ); |
(since C99) | |
| double atan2( double y, double x ); |
(since C99) | |
| long double atan2l( long double y, long double x ); |
(since C99) | |
Computes the inverse tangent of y/x using the signs of arguments to correctly determine quadrant.
Contents |
[edit] Parameters
| x, y | - | floating point value |
[edit] Return value
Arc tangent of y/x in radians in the range of [-π; π] radians.
atan2(+0, -0) return +π. atan2(-0, -0) return -π
atan2(+0, +0) return +0. atan2(-0, +0) return -0
atan2(+0, x) return +π if x<0 and +0 if x>0.
atan2(-0, x) return -π if x<0 and -0 if x>0.
atan2(y, 0) return -π/2 if y<0 and +π/2 if y>0.
atan2(y, -∞) returns +π if y>0 and -π if y<0
atan2(y, +∞) returns +0 if y>0 and -0 if y<0
atan2(+∞, x) returns +π/2. atan2(-∞, x) returns -π/2.
atan2(+∞, -∞) returns +3π/4. atan2(-∞, -∞) returns -3π/4.
atan2(+∞, +∞) returns +π/4. atan2(-∞, +∞) returns -π/4.
[edit] Example
| This section is incomplete Reason: no example |
[edit] See also
| computes arc tangent (arctan(x)) (function) | |
| computes arc sine (arcsin(x)) (function) | |
| computes arc cosine (arccos(x)) (function) | |
| computes tangent (tan(x)) (function) | |
| C++ documentation for atan2
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